Overview

• A massive, unpredictable swarm of jellyfish infiltrated the plant’s non-nuclear cooling-water filter drums, automatically shutting down reactors 2, 3, 4 and 6 on Aug. 10 and 11.
• With the two remaining units already offline for planned maintenance, EDF has kept all six reactors halted into Tuesday while teams carry out safety inspections and filter clearance.
• EDF says the shutdown presented no risk to reactor integrity, personnel or the environment, and that other power sources are covering regional electricity demand.
• The operator initially aimed for a Thursday restart but has moved to a staggered approach in which units are expected to come back online one by one later this week, subject to operational checks.
• Marine experts attribute the bloom to warmer sea temperatures and ecosystem shifts that are increasing jellyfish outbreaks, highlighting a recurring vulnerability for coastal, seawater-cooled power stations.